CN104285180A - Display device - Google Patents

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Publication number
CN104285180A
CN104285180A CN201380025437.4A CN201380025437A CN104285180A CN 104285180 A CN104285180 A CN 104285180A CN 201380025437 A CN201380025437 A CN 201380025437A CN 104285180 A CN104285180 A CN 104285180A
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CN
China
Prior art keywords
display
substrate
shape anisotropy
display device
light
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Granted
Application number
CN201380025437.4A
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Chinese (zh)
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CN104285180B (en
Inventor
中原隆裕
佐藤英次
中村浩三
渡边寿史
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Sharp Corp
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Sharp Corp
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    • G—PHYSICS
    • G02—OPTICS
    • G02F—OPTICAL DEVICES OR ARRANGEMENTS FOR THE CONTROL OF LIGHT BY MODIFICATION OF THE OPTICAL PROPERTIES OF THE MEDIA OF THE ELEMENTS INVOLVED THEREIN; NON-LINEAR OPTICS; FREQUENCY-CHANGING OF LIGHT; OPTICAL LOGIC ELEMENTS; OPTICAL ANALOGUE/DIGITAL CONVERTERS
    • G02F1/00—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics
    • G02F1/01—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics for the control of the intensity, phase, polarisation or colour 
    • G02F1/13—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics for the control of the intensity, phase, polarisation or colour  based on liquid crystals, e.g. single liquid crystal display cells
    • G02F1/133—Constructional arrangements; Operation of liquid crystal cells; Circuit arrangements
    • G02F1/1333—Constructional arrangements; Manufacturing methods
    • G02F1/1335—Structural association of cells with optical devices, e.g. polarisers or reflectors
    • G02F1/133509—Filters, e.g. light shielding masks
    • G02F1/133514—Colour filters
    • G—PHYSICS
    • G02—OPTICS
    • G02F—OPTICAL DEVICES OR ARRANGEMENTS FOR THE CONTROL OF LIGHT BY MODIFICATION OF THE OPTICAL PROPERTIES OF THE MEDIA OF THE ELEMENTS INVOLVED THEREIN; NON-LINEAR OPTICS; FREQUENCY-CHANGING OF LIGHT; OPTICAL LOGIC ELEMENTS; OPTICAL ANALOGUE/DIGITAL CONVERTERS
    • G02F1/00—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics
    • G02F1/01—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics for the control of the intensity, phase, polarisation or colour 
    • G02F1/165—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics for the control of the intensity, phase, polarisation or colour  based on translational movement of particles in a fluid under the influence of an applied field
    • G02F1/166—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics for the control of the intensity, phase, polarisation or colour  based on translational movement of particles in a fluid under the influence of an applied field characterised by the electro-optical or magneto-optical effect
    • G02F1/167—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics for the control of the intensity, phase, polarisation or colour  based on translational movement of particles in a fluid under the influence of an applied field characterised by the electro-optical or magneto-optical effect by electrophoresis
    • G—PHYSICS
    • G02—OPTICS
    • G02F—OPTICAL DEVICES OR ARRANGEMENTS FOR THE CONTROL OF LIGHT BY MODIFICATION OF THE OPTICAL PROPERTIES OF THE MEDIA OF THE ELEMENTS INVOLVED THEREIN; NON-LINEAR OPTICS; FREQUENCY-CHANGING OF LIGHT; OPTICAL LOGIC ELEMENTS; OPTICAL ANALOGUE/DIGITAL CONVERTERS
    • G02F1/00—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics
    • G02F1/01—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics for the control of the intensity, phase, polarisation or colour 
    • G02F1/19—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics for the control of the intensity, phase, polarisation or colour  based on variable-reflection or variable-refraction elements not provided for in groups G02F1/015 - G02F1/169
    • G—PHYSICS
    • G02—OPTICS
    • G02F—OPTICAL DEVICES OR ARRANGEMENTS FOR THE CONTROL OF LIGHT BY MODIFICATION OF THE OPTICAL PROPERTIES OF THE MEDIA OF THE ELEMENTS INVOLVED THEREIN; NON-LINEAR OPTICS; FREQUENCY-CHANGING OF LIGHT; OPTICAL LOGIC ELEMENTS; OPTICAL ANALOGUE/DIGITAL CONVERTERS
    • G02F1/00—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics
    • G02F1/01—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics for the control of the intensity, phase, polarisation or colour 
    • G02F1/13—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics for the control of the intensity, phase, polarisation or colour  based on liquid crystals, e.g. single liquid crystal display cells
    • G02F1/133—Constructional arrangements; Operation of liquid crystal cells; Circuit arrangements
    • G02F1/13306—Circuit arrangements or driving methods for the control of single liquid crystal cells
    • G—PHYSICS
    • G02—OPTICS
    • G02F—OPTICAL DEVICES OR ARRANGEMENTS FOR THE CONTROL OF LIGHT BY MODIFICATION OF THE OPTICAL PROPERTIES OF THE MEDIA OF THE ELEMENTS INVOLVED THEREIN; NON-LINEAR OPTICS; FREQUENCY-CHANGING OF LIGHT; OPTICAL LOGIC ELEMENTS; OPTICAL ANALOGUE/DIGITAL CONVERTERS
    • G02F1/00—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics
    • G02F1/01—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics for the control of the intensity, phase, polarisation or colour 
    • G02F1/13—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics for the control of the intensity, phase, polarisation or colour  based on liquid crystals, e.g. single liquid crystal display cells
    • G02F1/133—Constructional arrangements; Operation of liquid crystal cells; Circuit arrangements
    • G02F1/1333—Constructional arrangements; Manufacturing methods
    • G02F1/1335—Structural association of cells with optical devices, e.g. polarisers or reflectors
    • G02F1/133553—Reflecting elements
    • G02F1/133555—Transflectors
    • G—PHYSICS
    • G02—OPTICS
    • G02F—OPTICAL DEVICES OR ARRANGEMENTS FOR THE CONTROL OF LIGHT BY MODIFICATION OF THE OPTICAL PROPERTIES OF THE MEDIA OF THE ELEMENTS INVOLVED THEREIN; NON-LINEAR OPTICS; FREQUENCY-CHANGING OF LIGHT; OPTICAL LOGIC ELEMENTS; OPTICAL ANALOGUE/DIGITAL CONVERTERS
    • G02F1/00—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics
    • G02F1/01—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics for the control of the intensity, phase, polarisation or colour 
    • G02F1/13—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics for the control of the intensity, phase, polarisation or colour  based on liquid crystals, e.g. single liquid crystal display cells
    • G02F1/133—Constructional arrangements; Operation of liquid crystal cells; Circuit arrangements
    • G02F1/1333—Constructional arrangements; Manufacturing methods
    • G02F1/1335—Structural association of cells with optical devices, e.g. polarisers or reflectors
    • G02F1/1336—Illuminating devices
    • G02F1/133621—Illuminating devices providing coloured light
    • G—PHYSICS
    • G02—OPTICS
    • G02F—OPTICAL DEVICES OR ARRANGEMENTS FOR THE CONTROL OF LIGHT BY MODIFICATION OF THE OPTICAL PROPERTIES OF THE MEDIA OF THE ELEMENTS INVOLVED THEREIN; NON-LINEAR OPTICS; FREQUENCY-CHANGING OF LIGHT; OPTICAL LOGIC ELEMENTS; OPTICAL ANALOGUE/DIGITAL CONVERTERS
    • G02F1/00—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics
    • G02F1/01—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics for the control of the intensity, phase, polarisation or colour 
    • G02F1/165—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics for the control of the intensity, phase, polarisation or colour  based on translational movement of particles in a fluid under the influence of an applied field
    • G02F1/1685—Operation of cells; Circuit arrangements affecting the entire cell

Abstract

Provided is a semi-transparent display device with which light transmissibility rate is high, it is possible to ensure sufficient brightness in a display, and it is also possible to display blackness. A semi-transparent display device (1) comprises a display panel (2), and a backlight (3). The display panel (2) further comprises: a substrate (10) further comprising an electrode (12); a substrate (20) further comprising an electrode (22); and a light modulation layer (30) containing shape anisotropy members (32). When a frequency of a voltage applied between the electrodes (12, 22) is changed and the shape anisotropy members (32) are rotated, and the shape anisotropy members (32) are oriented such that the major axes thereof are parallel to one adjacent substrate, entering light is multiply reflected and blackness displayed.

Description

Display device
Technical field
The present invention relates to toggle reflections display and transmission to show and carry out the display device of the Semitransmissive shown.
Background technology
Liquid crystal indicator is widely used in the electronic equipments such as monitor, projector, pocket telephone, portable information terminal (PDA).
This liquid crystal indicator has reflection-type, transmission-type, Semitransmissive (reflection and transmission type) 3 kinds.
In addition, the liquid crystal indicator of reflection and transmission type, utilizes backlight light to carry out transmission display under waiting darker illumination in doors, and utilizes illumination light to carry out reflective display under waiting brighter illumination without.Thereby, it is possible to illumination lightness independently under various illumination (under luminous environment) show.Therefore, the liquid crystal indicator of Semitransmissive is loaded in the mobile devices such as portable phone, PDA, digital camera (for example, referring to patent documentation 1) more.
Figure 14 is the sectional view of the schematic configuration of the liquid crystal panel schematically showing the liquid crystal indicator that patent documentation 1 is recorded.
Prior art document
Patent documentation
Patent documentation 1: Japanese Unexamined Patent Publication 2003-161944 publication (on June 6th, 2003 is open)
Patent documentation 2: Japanese Unexamined Patent Application Publication 2007-506152 publication (on March 15th, 2007 is open)
Summary of the invention
The problem that invention will solve
But the liquid crystal panel of the liquid crystal indicator of this Semitransmissive, as shown in figure 14, is divided into the reflective display portion being provided with reflecting electrode and the transmission display part being provided with transparency electrode by 1 pixel.
Therefore, simple consideration is known, and the aperture opening ratio of each display is reduced to less than 50%, cannot carry out the display of abundant lightness.
In addition, liquid crystal panel as shown in figure 14, in order to control the transmission of light, only making the polaroid of the polarized component transmission of specific direction, being arranged at the opposition side of the opposite face of the liquid crystal layer in a pair substrate respectively.Therefore, incide the light of liquid crystal panel, only a part is by polaroid, and most light is polarized sheet and absorbs.Therefore, this polaroid absorbs the loss of the light that photoconduction causes, and becomes and the utilization ratio of light is reduced, the important reason that transmissivity is reduced.
Like this, in liquid crystal panel, use polaroid, so the transmissivity of light is low, the display of sufficient lightness cannot be carried out.
On the other hand, in recent years, the exploitation of the display panel of polaroid is not needed constantly to make progress.Patent Document 2 discloses to make to incide and be suspended the Transmission light of layer or the transflective display of reflection containing multiple particle.
Figure 15 (a), (b) are the sectional views of the schematic configuration representing the suspension particles device 301 used in the transflective display of record in patent documentation 2, Figure 15 (a) represents the sectional view of Transmission light state, and Figure 15 (b) represents the sectional view of light reflection state.
The suspension particles device 301 recorded in patent documentation 2, as shown in Figure 15 (a), (b), comprising: transparent panel 303 opposite each other and insulated substrate 304; Clamp with by this transparent panel 303 and insulated substrate 304, reflective particles 311 is suspended in and is suspended fluid 302 in dielectric fluid 312.
In addition, suspension particles device 301 comprises: be applied for the electrode 305,306 making reflective particles 311 electric field V1 of orientation on the direction vertical with insulated substrate 304 with transparent panel 303; Be applied for the electrode 308,309 making reflective particles 311 electric field V2 of orientation on the direction parallel with insulated substrate 304 with transparent panel 303.
Thus, suspension particles device 301 pairs of reflective particles 311 apply voltage and make the horizontal or vertical orientation of reflective particles 311, make the Transmission light of not shown backlight or external light reflection is shown thus.
But the transflective display recorded in patent documentation 2, only shows not shown backlight light, shows the reflected light of reflective particles 311 under light reflection state, can not show " black " under Transmission light state.
The present invention is point in view of the above problems, and its object is to provides a kind of transmissivity of light high, display can be made to guarantee sufficient lightness, and can show the display device of the Semitransmissive of black.
For the technological means of dealing with problems
In order to solve above-mentioned problem, display device of the present invention is a kind of display device of Semitransmissive, it comprises display panel and backlight, and toggle reflections display shows to show with transmission, above-mentioned reflective display is by showing the light reflection from external incident, above-mentioned transmission display is by making the Transmission light irradiated from above-mentioned backlight show, and above-mentioned display panel comprises: (I) (i) has the first substrate of the first electrode, (ii) there is the second electrode and the second substrate be oppositely disposed with above-mentioned first substrate, (iii) optical modulation layer, it comprises multiple shape anisotropy parts and is held between above-mentioned first substrate and above-mentioned second substrate, above-mentioned shape anisotropy parts have reflecting surface, and make to change from the area of the projection image viewed from the normal direction of substrate by rotating, (II) above-mentioned display device makes above-mentioned shape anisotropy parts rotate by changing the frequency putting on above-mentioned first electrode and above-mentioned second interelectrode voltage, thus control the transmissivity inciding the light of above-mentioned optical modulation layer, and, (III) base-adjacent in above-mentioned shape anisotropy parts and above-mentioned first substrate and above-mentioned second substrate is made, and during with the mode orientation that the major axis of the shape anisotropy parts with this base-adjacent is parallel with aforesaid substrate, make the light inciding above-mentioned optical modulation layer at above-mentioned shape anisotropy parts multipath reflection, thus display black.
According to said structure, by changing the frequency putting on above-mentioned first and second interelectrode voltages, above-mentioned shape anisotropy parts are rotated, make changing from the area of the projection image that the normal direction of substrate is seen of above-mentioned shape anisotropy parts, thus the transmissivity of the light inciding above-mentioned optical modulation layer can be controlled, so just can realize reflective display and transmission display by means of only the rotation of shape anisotropy parts (orientation).
And, now, above-mentioned shape anisotropy parts are rotated, make a base-adjacent in above-mentioned shape anisotropy parts and above-mentioned first and second substrates, and during with the mode orientation that the major axis of the shape anisotropy parts with this base-adjacent is parallel with aforesaid substrate, make the light generation multipath reflection inciding above-mentioned optical modulation layer to show black, so just can black be shown by means of only the rotation (orientation) of above-mentioned shape anisotropy parts.
Therefore, need not being transmissive display area and reflection display area by 1 pixel segmentation to show black, the switching that black display and reflective display and transmission show can be realized in the lump.That is, above-mentioned display device can carry out black display, and 1 pixel entirety can be made to switch to transmission display and reflective display.
And, according to said structure, do not need to arrange respectively as described in Patent Document 2 for making reflective particles at the electrode of the direction orientation vertical with substrate with for making reflective particles at the electrode with orientation on the direction of substrate-parallel.In addition, polaroid need not be needed as liquid crystal indicator.
Therefore, according to said structure, a kind of structure can be provided simple and the transmissivity of light is high, display can be made to guarantee sufficient lightness, and the display device of the Semitransmissive of black can be shown.
In addition, preferred above-mentioned optical modulation layer is included in the shape anisotropy parts of at least 2 amounts of folding layer by layer when above-mentioned shape anisotropy parts are paved with on an above-mentioned substrate.
According to said structure, can make shape anisotropy parts more than 2 layers adjoining farmland neighbours on substrate access to.Therefore, it is possible to reliably form that can cause multipath reflection, that the surface of shape anisotropy parts tilts layer.
Therefore, even if when above-mentioned shape anisotropy parts use the thin slice of simple rectangular parallelepiped, the shape anisotropy parts of the superiors towards also not with substrate-parallel, exterior light generation multipath reflection, light can not return light incident side.Therefore, reflected light reduces, and can carry out black display.
In addition, the thin slice of rectangular parallelepiped is used as above-mentioned shape anisotropy parts, cheap and bright display can be obtained so preferably, use so rectangular-shaped thin slice to have very large advantage to cause multipath reflection.
Therefore, above-mentioned shape anisotropy parts are preferably the thin slice of rectangular parallelepiped.
In addition, preferred above-mentioned optical modulation layer is included in the shape anisotropy parts of the amount of when being paved with on an above-mentioned substrate by above-mentioned shape anisotropy parts stacked tens of layers.
Thereby, it is possible to integrally form that can cause multipath reflection, that the surface of shape anisotropy parts tilts layer more reliably throughout substrate.
Above-mentioned display device can adopt following structure: put between above-mentioned first electrode and the above-mentioned second interelectrode voltage high frequency more than frequency is the low frequency of below the direct current of 0Hz or the first threshold that presets and the Second Threshold that presets and switch.
Thus, above-mentioned shape anisotropy parts are rotated, changes the area from the projection image that the normal direction of substrate is seen of above-mentioned shape anisotropy parts, the transmissivity of the light inciding above-mentioned optical modulation layer can be controlled.
In addition, above-mentioned display device can adopt following structure: above-mentioned shape anisotropy parts are when putting on above-mentioned first electrode and above-mentioned second interelectrode voltage and being the low frequency of below direct current or above-mentioned first threshold, with the mode orientation that its major axis is parallel with above-mentioned second substrate with above-mentioned first substrate, when putting on above-mentioned first electrode and above-mentioned second interelectrode voltage is the high frequency of more than above-mentioned Second Threshold, with the mode orientation that its major axis is vertical with above-mentioned second substrate with above-mentioned first substrate.
In addition, preferred above-mentioned shape anisotropy parts have charging property.
According to said structure, by changing the frequency putting on the voltage of above-mentioned first and second substrates, shape anisotropy parts can be made to rotate, and can make above-mentioned shape anisotropy parts with have with above-mentioned shape anisotropy parts the mode orientation adjacently that againsts of the substrate of electrode of electric charge of charged opposite polarity polarity.
In addition, above-mentioned display device is preferred: in above-mentioned shape anisotropy parts and above-mentioned first substrate and above-mentioned second substrate have with above-mentioned shape anisotropy parts the base-adjacent ground orientation of electrode of electric charge of charged opposite polarity polarity, and, switch the above-mentioned first electrode charged polarity of institute and the charged polarity of above-mentioned second electrode, thus, switch between above-mentioned first substrate and above-mentioned second substrate above-mentioned shape anisotropy parts the substrate of orientation adjacently.
Thereby, it is possible to switch such as white display and black display in reflective display.In addition, such as, by carrying out area active drive to backlight, such as, different displays can be carried out to each field of illumination (that is, each subregion field of illumination, each pixel) preset.
In addition, above-mentioned display device is preferred: when transmission shows and reflective display time, make any one base-adjacent ground orientation in above-mentioned shape anisotropy parts and above-mentioned first substrate and above-mentioned second substrate thus multipath reflection occurs, thus, make when reflective display by means of only the orientation of above-mentioned shape anisotropy parts and transmission display time all show black.
No matter thereby, it is possible to provide a kind of when reflective display or the display device of Semitransmissive of black can both be shown when transmission shows.
In addition, the light-emitting area of the preferred above-mentioned backlight of above-mentioned display device is divided into multiple subregion field of illumination, is configured with light source in each subregion field of illumination.
According to said structure, by carrying out area active drive, transmission display and reflective display can be switched by each subregion field of illumination (such as each pixel).
In addition, be preferably configured with in above-mentioned each subregion field of illumination send each coloured light light source as above-mentioned light source.
According to said structure, make above-mentioned shape anisotropy parts to incide the mode orientation of the Transmission light optical modulation layer of optical modulation layer from above-mentioned backlight (such as when transmission shows, orientation in a direction perpendicular to the substrate), thus, even if do not use colored filter also can carry out colour display.
In addition, preferred above-mentioned light source is monochromatic luminous light source.
According to said structure, the colour display of the color preset can be carried out in each above-mentioned subregion field of illumination with simple structure.
In addition, above-mentioned display device preferably switches illuminant colour by each subregion field of illumination.
Thereby, it is possible at random switch the illuminant colour of backlight in arbitrary region.
In addition, when above-mentioned display device is preferably viewed from the direction vertical with aforesaid substrate, the region corresponding with the boundary member of each subregion field of illumination of above-mentioned backlight of above-mentioned optical modulation layer is provided with separator.
Thereby, it is possible to prevent movement and the deflection of the shape anisotropy parts in the viewing area of the above-mentioned display panel corresponding with each subregion field of illumination of above-mentioned backlight.In addition, when carrying out colour display, can prevent from, in the viewing area of above-mentioned display panel corresponding to each subregion field of illumination with above-mentioned backlight, colour mixture occurs.
In addition, preferred above-mentioned shape anisotropy parts are colored.
Thus, when reflective display, by making the base-adjacent of shape anisotropy parts and display surface side and with the mode orientation of the substrate-parallel of the major axis of the shape anisotropy parts of the base-adjacent with this display surface side and this display surface side, the reflected colour of above-mentioned shape anisotropy parts can being observed.Therefore, according to said structure, do not use colored filter just can carry out colour display when reflective display.
In addition, above-mentioned display device preferably carries out area active drive to above-mentioned backlight, carries out transmission display and reflective display thus simultaneously.
Carrying out the region of reflective display, can backlight extinguished.Therefore, according to said structure, one can be provided simultaneously can to carry out transmission display and reflective display, and the display device of the Semitransmissive of power consumption can be reduced.
In addition, in this case, the part of such as display white or black can be adopted to carry out reflective display, the part of carrying out colored display carries out the structure of transmission display.
According to said structure, the part of display white or black shows in the mode extinguishing backlight, on the other hand, can carry out the beautiful colour display based on transmission display.Thereby, it is possible to suppress power consumption and carry out beautiful colour display.
In addition, preferably each pixel of above-mentioned display panel is provided with colored filter.
According to said structure, beautiful full-color display can be carried out by simple structure.
In addition, in this case, preferred above-mentioned colored filter is arranged at the substrate of display surface side.Thus, when the substrate-side orientation making above-mentioned shape anisotropy parts in display surface side carries out colour display, the parallax occurred between optical modulation layer and colored filter can be suppressed, so the colour display of high-quality can be realized.
The effect of invention
As mentioned above, display device of the present invention is that the display of a kind of toggle reflections shows to carry out the display device of the Semitransmissive shown with transmission.According to the present invention, change the frequency putting on the first and second interelectrode voltages arranged on the first and second substrates of relative configuration, the shape anisotropy parts being held on the optical modulation layer between the first and second substrates are rotated, the transmissivity of the light inciding above-mentioned optical modulation layer can be controlled thus.Therefore, the rotation (orientation) by means of only shape anisotropy parts just can realize reflective display and transmission display.
And, now, above-mentioned shape anisotropy parts are rotated, make above-mentioned shape anisotropy parts with a base-adjacent in above-mentioned first and second substrates and with the mode orientation that the major axis of the shape anisotropy parts with this base-adjacent is parallel with aforesaid substrate time, make the light generation multipath reflection inciding above-mentioned optical modulation layer to show black, so just can black be shown by means of only the rotation (orientation) of above-mentioned shape anisotropy parts.
Therefore, according to the present invention, a kind of structure can be provided simple and the transmissivity of light is high, display can be made to guarantee sufficient lightness, and the display device of the Semitransmissive of black can be shown.
Accompanying drawing explanation
Fig. 1 (a), (b) are the sectional views of the schematic configuration of the major part of the display device representing embodiments of the present invention 1.
Fig. 2 is the sectional view of an example of the schematic configuration of the power circuit representing the display device shown in Fig. 1 (a), (b).
Fig. 3 (a), (b) are the sectional views of another schematic configuration of the major part of the display device representing embodiments of the present invention 1.
Fig. 4 represents as shape anisotropy parts, use exceedes in order to when with the thin slice of the amount of the degree of the amount needed for the surface of 1 layer of thin slice (flake) covered substrate, enters a part for other thin slice and the schematic diagram of the appearance tilted in the gap of thin slice and thin slice.
Fig. 5 represents that the schematic diagram of the state of multipath reflection occurs because of thin slice the exterior light incided in optical modulation layer when using thin slice as shape anisotropy parts.
Fig. 6 (a), (b) are the sectional views of the schematic configuration of the major part of the display device representing embodiments of the present invention 2.
Fig. 7 is other sectional view of the schematic configuration of the major part of the display device representing embodiments of the present invention 2.
Fig. 8 is another other the sectional view of the schematic configuration of the major part of the display device representing embodiments of the present invention 2.
Fig. 9 (a), (b) are the sectional views of the schematic configuration of the major part of the display device representing embodiments of the present invention 3.
Figure 10 is other sectional view of the schematic configuration of the major part of the display device representing embodiments of the present invention 3.
Figure 11 is the sectional view of the schematic configuration of the major part of the display device representing embodiments of the present invention 4.
Figure 12 is the block diagram of the schematic configuration of the major part of the display device representing embodiments of the present invention 4.
Figure 13 is the sectional view of the schematic configuration of the major part of the display device representing embodiments of the present invention 5.
Figure 14 is the sectional view of the schematic configuration of the liquid crystal panel schematically showing the liquid crystal indicator that patent documentation 1 is recorded.
Figure 15 (a), (b) are the sectional views of the schematic configuration representing the suspension particles device used in the transflective display of record in patent documentation 2.
Embodiment
Below, embodiments of the present invention are described in detail.
[embodiment 1]
Based on Fig. 1 (a), (b) ~ Fig. 5, an embodiment of the invention are described as follows.
The schematic configuration > of < display device
Fig. 1 (a), (b) are the sectional views of the schematic configuration of the major part of the display device 1 representing present embodiment, represent the appearance of the direction of orientation of shape anisotropy parts 32 (such as, laminar metal oval sheet) with shape anisotropy, orientation (accumulation) position being carried out to various change.
In addition, when Fig. 1 (a) represents black display when carrying out transmission display and white display time sectional view, when Fig. 1 (b) represents black display when carrying out reflective display and white display time sectional view.In addition, the right figure of Fig. 1 (a), (b) and left figure represents the schematic configuration of 1 pixel respectively.
As shown in Fig. 1 (a), (b), the display device 1 of present embodiment is the display device of so-called Semitransmissive, and it comprises: display panel 2; Display panel 2 is irradiated to the backlight 3 of light; With not shown driving circuit, make to show from the Transmission light display panel 2 of backlight 3 outgoing, and incident external light reflection is shown.
In addition, the structure of backlight 3 is same as the prior art.Therefore, to the incomplete structure explanation of backlight 3.As backlight 3, the planar light source device etc. of such as edge light type and full run-down type suitably can be used.In addition, as the light source (light emitting source) of backlight 3, the point source of light etc. such as the linear light sources such as fluorescent tube, light emitting diode (LED) suitably can be used.
In addition, in Fig. 1 (a), (b), in the light source of backlight 3, use LED, and the light source of backlight 3 illustrates as backlight 3.As above-mentioned LED, the LED (white-light luminescent component) such as sending white light from 1 LED chip can be used, also can use the white-light luminescent component be molded onto by the assorted LED chip of R (redness), G (green), B (blueness) in 1 encapsulation, also can use such as by white-light luminescent component that blue led and yellow luminescent phosphor combine.In addition, as shown in embodiment described later, also the LED such as with the illuminant colour of R look, G look or B look can be used as backlight 3 (i.e. the light source of backlight 3).
The optical modulation layer 30 that display panel 2 comprises a pair substrate 10,20 opposite each other and is configured between this pair substrate 10,20.
In addition, display panel 2 has multiple pixels of ranks shape arrangement.
In addition, backlight 3 side (rear side) is configured at below with substrate 10 (first substrate), the situation citing that substrate 20 (second substrate) is configured at display surface side (observer side) is described, but present embodiment is not limited thereto.
Below above-mentioned each structure is described.
< substrate 10 and substrate 20>
Substrate 10 is active-matrix substrates.Substrate 10 is provided with on-off element and the dielectric films such as not shown various signal wires (scan signal line, data signal line etc.), TFT (thin film transistor (TFT)) on insulated substrate 11, has the structure being provided with electrode 12 (pixel electrode) on them.In addition, drive the structure of the driving circuit of various signal wire (scan signal line drive circuit, data signal wire driving circuit) etc. same as the prior art.
Electrode 12 is not shown drain electrodes, is connected, is applied in the signal corresponding to signal of video signal with on-off elements such as signal wire (scan signal line, data signal line) and TFT.
On the other hand, substrate 20 is opposing substrate, and insulated substrate 21 is provided with electrode 22 (common electrode).
As insulated substrate 11,21, as long as have light transmission and insulativity, the transparency carriers such as such as glass substrate can be used.
Electrode 12,22 is transparency electrode, is formed by the nesa coating of such as ITO (indium tin oxide), IZO (indium-zinc oxide), zinc paste, tin oxide etc.In addition, electrode 12 is formed in each pixel, and electrode 22 is formed as shared whole planar in whole pixel.Wherein, electrode 22 also can be formed in each pixel equally with electrode 12.
Thickness of electrode and the formation method of electrode 12,22 are not particularly limited, and can design, select in the same manner as the electrode on liquid crystal panel.In addition, the material, thickness, formation method etc. of on-off element, various signal wire, insulation course etc. also can design, select in the same manner as these parts in liquid crystal panel.
< optical modulation layer 30>
Optical modulation layer 30 is arranged between substrate 10,20, the multiple shape anisotropy parts 32 comprising medium 31 and be contained in medium 31.
Optical modulation layer 30 is such as formed in the following manner: substrate 10 and substrate 20 are fitted by sealant across sept (not shown), and the space inclosure between two substrates 10,20 comprises the medium 31 of shape anisotropy parts 32 and formed.
Utilize the power circuit 33 (power supply) be connected with electrode 12,22 to apply voltage to electrode 12,22, thus electric field is applied to optical modulation layer 30.Now, optical modulation layer 30 according to the change executing alive frequency put between electrode 12,22, make from backlight 3 incide the light of optical modulation layer 30 transmissivity and from external incident to optical modulation layer 30 the reflectivity of light (exterior light) change.At this, in this instructions, be that the situation of 0Hz is called " direct current " by the frequency of alternating voltage.The thickness (unit (cell) thickness) of optical modulation layer 30, the long axis direction according to shape anisotropy parts 32 sets, such as, be set as 80 μm.
< shape anisotropy parts 32>
Shape anisotropy parts 32 are the response components with shape anisotropy rotating according to the direction of electric field or be out of shape.In display characteristic, shape anisotropy parts 32 are that the area (projecting to the area of substrate 10,20) of the projection image of (time viewed from the normal direction of substrate 10,20) shape anisotropy parts 32 is according to optical modulation layer 30 being applied to the direction of electric field and the parts that change when overlooking.Wherein, above-mentioned projected area ratio (maximal projection area: minimum projection's area) is preferably more than 2:1.
Shape as shape anisotropy parts 32 can adopt such as laminar, cylindric, oval spherical, fiber (fiber) shape etc.
In addition, as laminar shape anisotropy parts 32 (thin slice), can use is such as the thin slice of simple rectangular parallelepiped (flat type, plane), the thin slice (bowl-type thin slice) etc. being formed as (the having male and fomale(M&F)) of bowl-type of surface curvature.
In addition, fibrous shape anisotropy parts 32 (fiber), can adopt the structure being such as formed with reflectance coating (metal or metal and resinous coat) on the glass of transparent column shape.
In addition, as shape anisotropy parts 32, for manufacturing cost aspect and enable the display that obtains when shape anisotropy parts 32 and substrate 10,20 vertical orientated (vertical orientation) becoming clear, preferably use the thin slice (laminar shape anisotropy parts 32) of simple rectangular parallelepiped (flat type, plane).
Such as, when using thin slice (that is, laminar shape anisotropy parts) as above-mentioned shape anisotropy parts 32, preferably its thickness is less than 1 μm, is more preferably less than 0.1 μm.
The thickness of shape anisotropy parts 32 is more thin more can obtain high transmissivity and the few black display of scattering.Therefore, thickness and the shape of shape anisotropy parts 32 have nothing to do, below the wavelength of particularly preferably light (such as, less than 0.5 μm).
In addition, shape anisotropy parts 32 are the charging property in medium 31 with plus or minus, and have the parts of the character of reflect visible light.
As shape anisotropy parts 32, can example if carry out the parts of electronic reciprocal with electrode, medium etc., or with the parts of the modifieds such as ionic silane coupling agent.
In addition, as the material of shape anisotropy parts 32, such as metal, semiconductor, dielectric or their compound substance can be adopted.In addition, multilayer dielectric film or cholesteric resin can be used.
In addition, the surface of shape anisotropy parts 32, in order to improve reflectivity, can apply mirror process, also can be formed concavo-convex.
When shape anisotropy parts 32 use metal, the aluminum slice (Aluminum flake) that general application such as can be used used.Such as, as shape anisotropy parts 32, aluminium (Al) thin slice of diameter 20 μm, thickness 0.3 μm can be used.
In addition, shape anisotropy parts 32 can carry out painted.Such as, can make it to be with look containing pigmented resin, inteferometer coating etc. by arranging at shape anisotropy parts 32, utilize painted after parts form shape anisotropy parts 32.
In addition, the proportion of shape anisotropy parts 32, preferred 11g/cm 3below, further preferably 3g/cm 3below, the proportion equal with medium 31 is more preferably.This is because, when the proportion of shape anisotropy parts 32 and medium 31 differ greatly, the sedimentation that can produce shape anisotropy parts 32 or the problem of swimming.
In addition, in present embodiment, as Fig. 1 (a), shown in (b), in order to the switching of reflective display and transmission display can be carried out in 1 pixel, use the shape anisotropy parts 32 of amount of the following stated: when shape anisotropy parts 32 with viewed from observer time the substrate 10 of rear side adjoin, and with time mode orientation (accumulation) that the major axis of the shape anisotropy parts 32 adjacent with substrate 10 is parallel with substrate 10 (in other words, shape anisotropy parts 32 with the mode that against with substrate 10 and substrate 10 adjacently orientation time), the amount of multipath reflection can be there is in the light inciding optical modulation layer 30 at shape anisotropy parts 32.
Specifically, use 2 layers of shape anisotropy parts 32 measured, preferably use the shape anisotropy parts 32 of tens of layers of amount.Namely, above-mentioned optical modulation layer 30 comprises the shape anisotropy parts 32 of the amount of the following stated: be paved with by shape anisotropy parts 32 when any one substrate (in this case substrate 10) is upper, shape anisotropy parts 32 at least 2 fold the amount of (accumulation) layer by layer, preferably tens of amount folded layer by layer.
Shape anisotropy parts 32 like this by piling up more than 2 layers on the substrate 10, reliably can form that can cause multipath reflection, that shape anisotropy parts 32 tilt to pile up layer (layer of the surface inclination of shape anisotropy parts 32).Therefore, when shape anisotropy parts 32 use the thin slice of rectangular parallelepiped, the shape anisotropy parts 32 of the superiors towards not with substrate 10,20 parallel, exterior light generation multipath reflection, light can not return light incident side.Therefore, reflected light reduces, and can carry out black display.
In addition, the shape anisotropy parts 32 measured by using tens of layers as mentioned above, that can cause multipath reflection throughout the overall formation more reliably of substrate, that shape anisotropy parts 32 tilt to pile up layer.
In addition, as shape anisotropy parts 32, when accumulation 1 layer amount or exceed the thin slice covered substrate 10 utilizing 1 layer surface needed for the thin slice of rectangular parallelepiped of amount of degree of amount, think and be difficult to seamlessly be paved with thin slice, consider that the gap substituted to a certain degree is vacated and piles up more than 2 layers in a part.
Fig. 4 represents as shape anisotropy parts 32, use exceedes for when with the thin slice of the amount of the degree of the amount needed for the surface of 1 layer of thin slice (flake) covered substrate 10, enters a part for other thin slice and the schematic diagram of the appearance tilted in the gap of thin slice and thin slice.
As shown in Figure 4, when thin slice is piled up on the substrate 10, if produce gap between thin slice and thin slice, then a part for thin slice can enter into this gap, thin slice can swing to more than 2 layers other thin slices piled up obliquely thus exist not with the thin slice of substrate-parallel, now can there is multipath reflection because of the thin slice of this inclination.
But, in this case, likely such as from this gap of incident light transmission of backlight 3 incidence, or turn back to observer side at the light of thin slice reflection.
In addition, as shape anisotropy parts 32, when using the thin slice of the bowl-type of such as surface curvature, even if when the thin slice only using 1 layer to measure, also can there is multipath reflection in the overlap mode according to thin slice.But in order to cause sufficient multipath reflection, thus make reflected light disappear, even the thin slice of bowl-type, 1 layer is also inadequate.
Therefore, in order to cause sufficient multipath reflection, thus reflected light is disappeared, the shape anisotropy parts 32 of the amount preferably containing accumulation more than 2 layers on the substrate 10 in optical modulation layer 30, are more preferably the shape anisotropy parts 32 containing the amount of piling up tens of layers.
In addition, as mentioned above, when using the thin slice of bowl-type, even if when the thin slice only using 1 layer to measure, also can there is multipath reflection in the overlap mode according to thin slice.But, when the thin slice and substrate making bowl-type vertical orientated (vertical orientation), different according to the bending degree on surface, make light scattering because of its shape, so likely backlight light transmission deficiently, form dark display.In addition, when thin slice is bowl-type, compared with the situation of the thin slice of the simple rectangular parallelepiped of use, cost improves.
Therefore, as shape anisotropy parts 32, although the shape anisotropy parts of various shape can be used as mentioned above, but use rectangular-shaped thin slice cheap and bright display can be obtained so preferably, use so rectangular-shaped thin slice to cause multipath reflection to have very large advantage.
< medium 31>
Medium 31, for have radioparent material in visible region, can be used in visible region roughly without the liquid absorbed or by they materials by pigment colored.In addition, the proportion of medium 31 is preferably equal with shape anisotropy parts 32.
In addition, medium 31, considers the operation be sealed in unit, the material that preferred volatility is low.In addition, the viscosity of medium 31 is relevant to response, preferred below 5mPas, in order to prevent sedimentation more preferably more than the 0.5mPas of shape anisotropy parts 32.
In addition, medium 31 can be formed by single material, also can be formed by the potpourri of multiple material.Such as, propylene carbonate, NMP (N methyl 2 pyrrolidone), fluorocarbon, silicone oil etc. can be used.
< display packing >
Then, the display packing (driving method) of the display panel 2 of display device 1 is specifically described.Wherein, at this, be described to use thin slice as the situation citing of shape anisotropy parts 32.
First, as substrate action, the transmissivity of the light of optical modulation layer 30 and the control method of light reflectance are described.
As mentioned above, the display panel 2 of present embodiment comprises: shape anisotropy parts 32 are scattered in the optical modulation layer 30 of medium 31; With the electrode 12,22 optical modulation layer 30 being applied to electric field, alive frequency is executed between electrode 12,22 by changing to put on, reversibly switch above-mentioned shape anisotropy parts 32 towards (area of projection image), and by switching the electrode 12 charged polarity of institute and the charged polarity of electrode 22, switch shape anisotropy parts 32 against the substrate of the side of ground orientation (that is, piling up).
Such as, to when applying voltage (alternating voltage) of such as frequency 60Hz of high frequency between electrode 12,22, due to dielectrophoresis phenomenon, Coulomb force or the power for the explanation of electric energy aspect viewpoint, as shown in the right figure of Fig. 1 (a), thin slice rotates to make its major axis parallel with line of electric force.That is, thin slice major axis with substrate 10,20 vertical mode orientations (vertical orientation).
Therefore, now, if such as use the such material with visible reflectance of sheet metal as thin slice, then because indulging orientation, the reflecting surface of thin slice and substrate 10,20 vertical.Consequently, the light of optical modulation layer 30 is incided from backlight 3, as shown in the right figure of Fig. 1 (a), direct transmission (passing through) optical modulation layer 30, or shine after reflective surface and the face of incident light opposite side (that is, observer side).
On the other hand, as shown in the left figure of left figure and Fig. 1 (b) of Fig. 1 (a) and right figure, when applying the voltage of such as frequency 0.1Hz or direct current (frequency=0Hz) of low frequency between electrode 12,22, because of the power utilizing electrophoretic force or Coulomb force to illustrate, the thin slice with charging property attracted to with its with the ate electrode of electric charge of opposite polarity polarity of electric charge.And thin slice gets the most stable orientation, be rotated into and against substrate 10 or substrate 20.
Consequently, thin slice is orientation as follows: with the substrate of the side that the thin slice in substrate 10,20 againsts (that is, be provided with thin slice the substrate of electrode of electric charge of charged polarity opposite polarity) major axis and the substrate 10 of adjacent thin slice, 20 parallel mode orientations (horizontal orientation).
Therefore, now, if such as use the such material with visible reflectance of sheet metal as thin slice, then because of horizontal orientation, the reflecting surface of thin slice and substrate 10,20 parallel.Consequently, externally to the light (such as, from backlight 3 to the light of optical modulation layer 30 incidence, or to the exterior light of optical modulation layer 30 incidence) of optical modulation layer 30 incidence at above-mentioned reflective surface, and the face of not transmission opposition side.
Like this, by by the direct current of the voltage putting on optical modulation layer 30 when frequency is 0 with exchange between switch, or switch between low frequency and high frequency, transmissivity (transmission light quantity) change inciding the light of optical modulation layer 30 from backlight 3 can be made.
In addition, frequency when thin slice is horizontal orientation (switching to horizontal orientation) is such as the value of 0Hz ~ 0.5Hz, and frequency when thin slice is vertical orientation (switching to vertical orientation) is such as the value of 30Hz ~ 1kHz.
These frequencies, the thickness (element thickness) etc. according to the shape of thin slice (shape anisotropy parts 32) and material, optical modulation layer 30 presets.That is, display device 1 is by switching putting between the low frequency of frequency below first threshold of voltage of optical modulation layer 30 and high frequency more than Second Threshold, and the transmissivity (transmission light quantity) of light is changed.At this, such as first threshold can be set as 0.5Hz, Second Threshold is set as 30Hz.
In addition, in Fig. 1 (a), (b), as an example, illustrate thin slice with the polarity of electric charge be positive situation.
In this case, as shown in the left figure of left figure and Fig. 1 (b) of Fig. 1 (a), when applying such as DC voltage between to electrode 12,22, if the minus side of power circuit 33 is connected with electrode 12, positive side is connected with electrode 22, then thin slice is to against the mode orientation of the substrate 10 of the electrode 12 be provided with negative electric charge.
In addition, as shown in the right figure of Fig. 1 (b), when applying such as DC voltage between to electrode 12,22, if the minus side of power circuit 33 is connected with electrode 22, positive side is connected with electrode 12, then thin slice is to against the mode orientation of the substrate 20 of the electrode 22 be provided with negative electric charge.
Like this, in the display device 1 of present embodiment, when making the horizontal orientation of thin slice, by switching the polarity to this voltage when applying DC voltage between the electrode 12,22 clipping optical modulation layer 30, thin slice can be made to switch in substrate 10 side or in ground, substrate 20 side orientation.
In addition, display device 1 comprises not shown control part, by power circuit 33, the voltage of the frequency being suitable for transmission display and reflective display is as mentioned above applied between above-mentioned electrode 12,22, and switches the polarity of the voltage put between electrode 12,22 as mentioned above.
In addition, display device 1 also can be provided with the such not shown optical sensor of the photodiode of the light grade of the surround lighting of the vicinity of detection display device 1, based on the data sent from above-mentioned optical sensor, above-mentioned control part determines that carrying out transmission display still carries out reflective display.
Fig. 2 is the sectional view of an example of the schematic configuration of the power circuit 33 representing the display device 1 shown in Fig. 1 (a), (b).
In addition, illustrate with the situation citing shown in the left figure of Fig. 1 (b) as an example in Fig. 2.
As shown in Figure 2, in the display device 1 of present embodiment, as power circuit 33, comprise the power circuit of the switch 34 (switch) of 2 kinds of direct supplys 33b, 33c that the configuration with such as AC power 33a, positive and negative configures on the contrary and the connection switching electrode 12,22 and these AC power 33a and direct supply 33b, 33c.
In such display device 1, in power circuit 33, the switching signal for switching the power supply be connected with electrode 12,22 is inputted by such as not shown control part, the power supply be connected with electrode 12,22 is switched based on inputted switching signal, easily can carry out the switching of DC voltage and alternating voltage thus, and can switch electrode 12 with the polarity of electric charge and electrode 22 with the polarity of electric charge.In other words, the polarity of the voltage put between electrode 12,22 can be switched.
In addition, in Fig. 2, as an example, illustrate with the situation using switch 34 to switch the power supply be connected with electrode 12,22 and be illustrated, but present embodiment is not limited thereto.Such as shown in embodiment 4 described later, also can switch the orientation of thin slice by using the on-off elements such as TFT to transmit control signal.
In addition, in Fig. 1 (a), (b) and Fig. 2, illustrate thin slice with the polarity of electric charge be positive situation, but being not limited thereto, can thin slice be also negative with the polarity of electric charge.In this case, the substrate that thin slice againsts is contrary with the example shown in Fig. 1 (a), (b).
Fig. 3 (a), (b) be represent thin slice with the polarity of electric charge be negative when the sectional view of schematic configuration of major part of display device 1.Wherein, when Fig. 3 (a) represents black display when carrying out transmission display and white display time sectional view, when Fig. 3 (b) represents black display when carrying out reflective display and white display time sectional view.In addition, the right figure of Fig. 3 (a), (b) and left figure represents the schematic configuration of 1 pixel respectively.
In this case, as shown in the left figure of left figure and Fig. 3 (b) of Fig. 3 (a), thin slice with the polarity of electric charge be negative, when applying such as DC voltage between to electrode 12,22, if the minus side of power circuit 33 is connected with electrode 22, positive side is connected with electrode 12, then thin slice be provided with the mode orientation that against with the substrate 10 of the electrode 12 of positive electric charge.
In addition, as shown in the right figure of Fig. 3 (b), thin slice with the polarity of electric charge be negative, when applying such as DC voltage between to electrode 12,22, if the minus side of power circuit 33 is connected with electrode 12, positive side is connected with electrode 22, then thin slice be provided with the mode orientation that against with the substrate 20 of the electrode 22 of positive electric charge.
< display mode >
The display device 1 of present embodiment is the display device of Semitransmissive, comprise the light (exterior light of the external incident from display device 1, i.e. ambient light) reflection carries out the reflection display mode that shows and makes the Transmission light irradiated from backlight 3 carry out the transmissive display mode shown, and switches above-mentioned reflection display mode and transmissive display mode shows.
Display device 1, such as waiting darker place within doors, utilizes backlight light to carry out transmission display (transmission mode).On the other hand, wait brighter place without, utilize exterior light to carry out reflective display (reflective-mode).Thereby, it is possible to independently realize contrast than high display with the lightness of surrounding.Therefore, no matter display device 1 can realize the display of (under luminous environment) under within doors outer various illuminations, so be applicable to the mobile devices such as portable phone, PDA, digital camera.
Below, each display (display mode) is described.
< transmission display >
In display panel 2, electrode 12,22 all uses transparency electrode, so as shown in Fig. 1 (a), can obtain transmission display.In this case, as shown in the left figure of Fig. 1 (a), become the state of light crested when thin slice is horizontal orientation, as shown in the right figure of Fig. 1 (a), thin slice becomes light transmissive state for during vertical orientation.
As shown in the left figure of Fig. 1 (a), in present embodiment, thin slice piles up more than 2 layers on the substrate 10, and thin slice tilts, and causes multipath reflection or light to be enclosed in layer thus, so the reflected light of thin slice disappears, can see black.
Fig. 5 represents when using thin slice as shape anisotropy parts 32, incides the schematic diagram of the state of the exterior light multipath reflection because of thin slice in optical modulation layer 30.
As shown in Figure 5, incide the light in optical modulation layer 30 from observer side, repeatedly interreflection, in this process optical attenuation in the layer of the thin slice piled up more than 2 layers, thus reflected light disappears.
Fig. 5 represents between the thin slice of reflectivity 90%, reflect in outlet 10 times, return road reflects the appearance of the reflection of the situation of 10 times.
In this case, the light interreflection of incident light 100%, turns back to the reflected light of observer side, according to following formula
(0.9^10)^2＝12％
Be 12%, exterior light is difficult to reflex to observer side, so contrast improves.Certainly, when light is enclosed in layer, reflected light disappears.
In addition, when carrying out transmission display, when the place that namely light is inadequate and darker around carries out showing, during thin slice horizontal orientation, thin slice piles up the substrate of side, both can be substrate 10 side also can be substrate 20 side.In this case, if make thin slice be piled up in substrate 10 side or substrate 20 side, then light not transmission, no matter so all become black display in which kind of situation.
But as mentioned above, be piled up in the light generation multipath reflection of mode at the reflective surface of thin slice of substrate 10 side of rear side viewed from observer, exterior light is difficult to reflex to observer side, contrast improves, so preferably.
On the other hand, by arranging backlight 3 in the rear side of display panel 2 and making thin slice indulge orientation, the transmission display that liquid crystal display is such can be carried out.
In addition, if display panel 2 is arranged at non-display (not being the body face etc. of common picture display face) of such as pocket telephone etc., then by making thin slice indulge orientation, can in the body color of non-display display pocket telephone, on the other hand, by making the horizontal orientation of thin slice, at the painted of non-display display thin slice or external light reflection can be made.
In addition, in such display device 1, electrode 12,22 can be formed, so also circuit structure can be simplified by segment electrode (segment electrode) or whole electrode.
< reflective display >
According to the present embodiment, even if electrode 12,22 uses transparency electrode as mentioned above, also reflective display can be obtained by the accumulation position changing thin slice.
That is, thin slice is as shown in the left figure of Fig. 1 (b), and when viewed from observer, substrate 10 side of side is piled up overleaf, exterior light is at thin slice generation multipath reflection as shown in Figure 5, and reflected light reduces.Thereby, it is possible to obtain black display.
On the other hand, thin slice is as shown in the right figure of Fig. 1 (b), and when substrate 20 side of observer side is piled up, exterior light, in sheet surface generation normal reflection, obtains reflected light.
Like this, when thin slice againsts substrate 20 of display surface side, ideally utilize the reflecting surface of thin slice to observe in the mode forming same plane (reflecting surface of same planar), the high display of specularity (catoptron reflection) can be obtained thus.But in fact the surface of thin slice is not minute surface and has concavo-convex, so can scattered light be obtained, seem to turn white.In addition, in fact thin slice can not ideally paste can produce on the base plate 20 and how much concavo-convex, so incident light scattering and seem to turn white.
In addition, now, when thin slice is sheet metal, can obtain the reflection of sheet metal, if form thin slice by colored article, then what can obtain that thin slice causes is painted.
Thereby, it is possible to realize the display device 1 that can switch black (the left figure of Fig. 1 (b)) and white (the right figure of Fig. 1 (b)) in reflective display.
In addition, light (ON (opening)) backlight 3 when transmission shows, extinguish (OFF (closedown)) backlight 3 when reflective display.When reflective display, do not use backlight 3, so few when power consumption shows than transmission.
< effect >
Like this, display device 1 according to the present embodiment, reflective display and transmission display all can realize white display and black display.
On the other hand, as described in Patent Document 2, by make reflective particles 311 (with reference to Figure 15 (a), (b)) be oriented in switch between horizontal orientation and vertical orientation come toggle reflections display mode and transmissive display mode when, as mentioned above, under reflection display mode, only show the reflected light of reflective particles 311, can the light of display backlight under transmissive display mode, and can not black be shown.
In addition, if only specialization is reflective display, then the substrate of rear side time such as viewed from observer arranges the light absorbing zone of black, makes thin slice indulge orientation, also can show black thus.But when being provided with such light absorbing zone, the not transmission of backlight light, so can not carry out transmission display.
Therefore, be oriented in the display panel switched between horizontal orientation and vertical orientation as such by thin slice, also transmission display is carried out in order to not only carry out reflective display, and realize black display, the reflective display portion of reflective-mode use and the transmission display part of transmission mode use must be formed as liquid crystal panel.
But, in this case, although can prevent from resulting from the decline of the transmissivity of polaroid, in the same manner as liquid crystal panel, become below half in each display mode under shed rate, so fully bright display cannot be obtained.
In contrast, according to the present embodiment, as mentioned above, by change in 1 pixel thin slice position and towards, transmission display and reflective display can be switched in 1 pixel entirety.
Such as when reflective display, as mentioned above, there is multipath reflection in the substrate 10 side time making thin slice be piled up in rear side, becomes black display, otherwise when being piled up in substrate 20 side of observer side, become white display.
On the other hand, when transmission shows, the place that light is inadequate and darker around, when making thin slice be piled up in substrate 10 side or substrate 20 side, light not transmission, so become black display, when making thin slice indulge orientation, Transmission light, so become white display.
Like this, display device 1 according to the present embodiment, can show the overall toggle reflections display of 1 pixel and transmission not according to display mode segmenting pixels like this, and by means of only thin slice orientation just can under reflective display and transmission show equal display white and black.
And, in patent documentation 2, in order to the direction of orientation of reflective particles 311 is switched between vertical orientation and horizontal orientation, need to be applied for the electrode 305,306 making reflective particles 311 electric field V1 of orientation on the direction vertical with insulated substrate 304 with transparent panel 303; Be applied for the electrode 308,309 making reflective particles 311 electric field V2 of orientation on the direction parallel with insulated substrate 304 with transparent panel 303.Therefore, complex structure.
Relative to ground, display device 1 according to the present embodiment, by changing the frequency putting on the voltage of electrode 12,22, can switch the vertical orientation of thin slice and horizontal orientation.Therefore, it is possible to provide a kind of structure simple and the transmissivity of light is high, display can be made to guarantee sufficient lightness, and the display device of the Semitransmissive of black can be shown.
[embodiment 2]
Based on Fig. 6 (a), (b) ~ Fig. 8, other embodiments of the present invention are described as follows.
In addition, in the following description, be mainly described the difference with embodiment 1, mark identical numbering to the inscape of the identical function of each inscape had with illustrated in above-mentioned embodiment 1, the description thereof will be omitted.
The schematic configuration > of < display device
Fig. 6 (a), (b) and Fig. 7 are the sectional view of the schematic configuration of the major part of the display device 1 representing present embodiment respectively.
In addition, when Fig. 6 (a) represents black display when carrying out transmission display and R (redness), G (green), B (blueness) display time sectional view, with sectional view when showing in vain when Fig. 6 (b) represents black display when carrying out reflective display.In addition, the right figure of Fig. 7 (a), (b) and left figure represents the schematic configuration of 1 pixel respectively, and Fig. 7 represents the schematic configuration of R (redness), G (green), B (blueness) 3 pixels.
As shown in Fig. 6 (a), (b), the basic structure of the display device 1 of present embodiment is identical with the display device 1 of embodiment 1.
The display device 1 of present embodiment is different from the display device 1 of embodiment 1 in the backlight this point being provided with the illuminant colour with R look, G look or B look as backlight 3.
In the display device 1 of present embodiment, such as shown in Figure 7, such as there is by each pixel fixed configurations the backlight 3 of the illuminant colour of R look, G look or B look.
The backlight 3 of these R, G, G colors, as shown in Figure 7, is arranged by the pixel order of R, G, G colors, always luminous when transmission shows.
In such display device 1, in order to not make the color colour mixture of adjacent element, as shown in Figure 7, can the separators 41 such as the rib of striated be set respectively between the pixel of different colours.Namely, in Fig. 6 (a), (b), use the situation of the display panel identical with the display panel 2 shown in Fig. 1 (a), (b) to illustrate with display panel 2 to illustrate, but also separator 41 can be set at the display panel 2 of Fig. 6 (a), (b).
Thereby, it is possible to prevent the colour mixture between neighbor, and also can prevent the deflection etc. that the movement of thin slice causes.
In addition, as long as above-mentioned separator 41 can prevent the colour mixture between neighbor, its material and size are not particularly limited to.
In addition, above-mentioned separator 41 also can double as the gap (cell gap) between substrate 10,20 is remained certain distance piece.Above-mentioned separator 41 such as can use the material same with general column spacer and method to be formed.
Then, the display packing of the situation using such display device 1 is described.In addition, also the situation using thin slice as shape anisotropy parts 32 is described below.
< transmission display >
When using such display device 1, such as, when wanting in full-color lower use, carry out action with transmission display.Such as when the display as e-book uses display device 1 of present embodiment, when magazine etc. needs to see full-color content, carry out action with transmission display.
In this case, as shown in right figure and Fig. 7 of Fig. 6 (a), when thin slice is for vertical orientation, luminous by the backlight 3 being arbitrarily positioned at R, G, B under each pixel, the illuminant colour of luminous backlight 3 is in sight.
On the other hand, as shown in the left figure of Fig. 6 (a), when thin slice is horizontal orientation, as illustrated in embodiment 1, the light not transmission of backlight 3, so see black.Thereby, it is possible to carry out full-color display.
In addition, same with embodiment 1, also carry out action by transmission display there is no the dark place of exterior light.
< reflective display >
On the other hand, when wanting with low consumption electricity usage, action is carried out with reflective display.In addition, also the situation citing using the display device 1 of present embodiment as the display of e-book is described at this.
Under these circumstances, such as, when the content of the black and white of news etc. is seen with suppressing power consumption in destination of going out, action is carried out with reflective display.
In this case, as shown in the left figure of Fig. 6 (b), when thin slice is horizontal orientation and is piled up in downside (substrate 10 side of rear side), as illustrated in embodiment 1, there is multipath reflection because of thin slice in exterior light, sees black.
Otherwise as shown in the right figure of Fig. 6 (b), when thin slice is piled up in upside (substrate 20 side of display surface side), as illustrated in embodiment 1, exterior light, in sheet surface generation normal reflection, sees white.
No matter in which kind of situation, do not use backlight 3 during reflective display, so few when power consumption shows than transmission.Therefore, the display of black and white can be carried out under low consumption electric power.
Like this, according to the present embodiment, when carrying out colour display, making thin slice indulge orientation, making the light inciding optical modulation layer 30 from backlight 3 arrive observer, thus, even if do not arrange colored filter also can carry out colour display.Thus, the display of black and white can not only be carried out with low consumption electric power, and when carrying out colour display, the loss of the light that colored filter also can be suppressed to cause, so can reduce the power consumption of backlight 3.
Like this, according to the present embodiment, the display device 1 of the display of energy switchable color and white and black displays can be realized.
< variation 1 >
In addition, in Fig. 7, illustrate with the citing of the situation of the backlight 3 by each pixel fixed configurations R, G, B.But present embodiment is not limited thereto.
Fig. 8 is the another sectional view of the schematic configuration of the major part of the display device 1 representing present embodiment.
Display device 1 shown in Fig. 8, is provided with the backlight 3 that can switch illuminant colour by each pixel.
Like this, by the illuminant colour of backlight 3 being replaced with R, G or B 1 pixel, also the display same with the display device 1 shown in Fig. 7 can be carried out.
In addition, when the illuminant colour of backlight 3 is replaced with R, G or B by 1 pixel, according to the signal of video signal being input to display device 1, the illuminant colour of backlight 3 at random can be switched in arbitrary region.
In addition, in this variation, for the viewpoint that power consumption is cut down, when not using backlight 3, when namely carrying out reflective display, also backlight 3 can be extinguished by each pixel.
< variation 2>
In addition, in present embodiment and above-mentioned variation 1, be described for the situation being provided with backlight 3 (light source of backlight 3) by each pixel.But present embodiment and above-mentioned variation 1 are not limited thereto, also backlight 3 (light source of backlight 3) can be set in each region corresponding with multiple pixels of display same color.
In this case, as long as arrange the separator 41 of the colour mixture of the light prevented from adjacent area incidence at each above-mentioned zone.
[embodiment 3]
Based on Fig. 9 (a), (b) and Figure 10, another embodiment of the invention is described as follows.
In addition, in the following description, be mainly described the difference with embodiment 1,2, mark identical numbering to the inscape of the identical function of each inscape had with illustrated in above-mentioned embodiment 1,2, the description thereof will be omitted.
The schematic configuration > of < display device
Fig. 9 (a), (b) and Fig. 9 are the sectional view of the schematic configuration of the major part of the display device 1 representing present embodiment respectively.
In addition, when Fig. 9 (a) represents black display when carrying out transmission display and R (redness), G (green), B (blueness) display time sectional view, when black when reflective display is carried out in Fig. 9 (b) expression shows and R (redness), G (green), B (blueness) expression time sectional view.In addition, the right figure of Fig. 9 (a), (b) and left figure represents the schematic configuration of 1 pixel respectively, and Figure 10 represents the schematic configuration of R (redness), G (green), B (blueness) 3 pixels.
As shown in Fig. 9 (a), (b), the basic structure of the display device 1 of present embodiment is such as identical with the display device 1 of embodiment 2.
The display device 1 of present embodiment is different from the display device 1 of embodiment 2 in surface (reflecting surface) the painted this point of shape anisotropy parts 32.
< shape anisotropy parts 32>
Use shape anisotropy parts 32 in present embodiment, as mentioned above, surface is colored.In addition, shape anisotropy parts 32 surface, can be painted by arranging containing pigmented resin, inteferometer coating etc., can by utilize painted after parts to form shape anisotropy parts 32 painted, also can be formed by multilayer dielectric film or cholesteric resin etc.
In addition, also can adopt and the gimmick such as by ink-jet, the potpourri of shape anisotropy parts 32 and medium 31 be applied respectively.
In present embodiment, by each pixel, shape anisotropy parts 32 are colored as redness, green or blue.Therefore, the shape anisotropy parts 32 of present embodiment at least comprise the shape anisotropy parts being colored as redness, the shape anisotropy parts being colored as green and are colored as blue shape anisotropy parts and form.
< separator 41>
In addition, in such display device 1, as shown in Fig. 9 (a), (b) He Figure 10, the such separator 41 illustrated in embodiment 2 is preferably set respectively between the pixel of different colours.
Thereby, it is possible to prevent the colour mixture of the transmitted light from backlight 3, and movement and the deflection of the shape anisotropy parts 32 being colored as different colours can be prevented, good colour display can be carried out.
Then, the display packing of the situation using such display device 1 is described.In addition, also the situation using thin slice as shape anisotropy parts 32 is described below.
< transmission display >
In present embodiment, the action of the display device 1 during transmission display, identical with embodiment 2.Therefore, in present embodiment, omit explanation when transmission is shown.
In addition, in present embodiment, backlight 3 also can as shown in Figure 7, and the backlight 3 of assorted (such as R, G, B) is fixedly arranged on each pixel, also as shown in Figure 8,1 pixel, the illuminant colour of backlight 3 can be switched to such as R, G or B.
In addition, the incident light of optical modulation layer 30 is incided from backlight 3, in direct transmitted light modulating layer 30, or to the display surface side transmission of the side contrary with the light incident side of incident light after the reflective surface of thin slice.
No matter in which kind of situation, the color on surface of the shape anisotropy parts 32 in all preferred each region of being separated by separator 41 is identical color with the illuminant colour of backlight 3.Thereby, it is possible to make the color of the light incided from backlight 3 in the direct transmitted light modulating layer 30 light in optical modulation layer 30 with after the reflective surface of thin slice to the solid colour of the light of display surface side transmission, so good colour display can be carried out.
< reflective display >
Display device 1 is at low consumption electric power and when wanting full-color use, as the display device 1 of present embodiment, utilize employ painted after the display device 1 of thin slice carry out reflective display.
In this case, as shown in the left figure of Fig. 9 (b), when thin slice is horizontal orientation and is piled up in downside (substrate 10 side of rear side), as illustrated in embodiment 1, there is multipath reflection because of thin slice in exterior light, sees black.
On the other hand, as shown in the left figure of Fig. 9 (b), when thin slice is piled up in upside (substrate 20 side of display surface side), exterior light, in sheet surface generation normal reflection, obtains the reflected light of thin slice.Now, by carrying out painted to the surface of thin slice, the painted display based on thin slice can be carried out.
As mentioned above, in embodiment 2, only can carry out colour display (full-color display) when transmission shows, but in the present embodiment, thin slice after being colored by using surface, reflective display also can carry out colour display (full-color display).
In addition, according to the present embodiment, during reflective display, backlight 3 is not used, so few when power consumption shows than transmission.Therefore, do not use backlight 3 during reflective display, colour display can be carried out with low consumption electric power.
In addition, according to the present embodiment, as mentioned above, no matter be transmission display or reflective display, colored filter be not set and just can carry out colour display.Thus, the loss of the light that colored filter can be suppressed to cause when carrying out colored display, no matter so can both reduce the power consumption of backlight 3 in which kind of situation.
< variation 1 >
In addition, in Fig. 9 (a), (b), same with embodiment 2, the situation citing using the backlight with the illuminant colour of R look, G look or B look as backlight 3 is illustrated.But present embodiment is not limited thereto, also can as illustrated in embodiment 1, use the LED (white-light luminescent component) that the sends white light backlight 3 as light source.
In this case, as mentioned above, as shown in Fig. 9 (b) He Figure 10, during reflective display, carry out the display of black or colour, on the other hand, during transmission display as shown in Fig. 1 (a), carry out the display of black or white.
Therefore, according to this variation, colour display can be carried out when carrying out the display of reflection-type, and dark and carry out white and black displays under the environment of visibility difference, the display paying attention to lightness can be carried out thus.
< variation 2>
In addition, in present embodiment, comprise with shape anisotropy parts 32 and be colored as red shape anisotropy parts, be colored as green shape anisotropy parts and the situation citing that is colored as blue shape anisotropy parts and formed is illustrated.
But, present embodiment is not limited thereto, also can substitute and be colored as redness, green, blue shape anisotropy parts 32, or comprise the shape anisotropy parts being colored as cyan (C), the shape anisotropy parts being colored as magenta (M) on this basis, be colored as the shape anisotropy parts of yellow (Y) at least partially.
[embodiment 4]
About another embodiment of the invention, be described as follows based on Figure 11 and Figure 12.
In addition, in the following description, mainly to embodiment 1 ~ 3 difference be described, mark identical numbering to the inscape of the identical function of each inscape had with illustrated in above-mentioned embodiment 1 ~ 3, the description thereof will be omitted.
The schematic configuration > of < display device
Figure 11 is the another sectional view of the schematic configuration of the major part of the display device 1 representing present embodiment.
In addition, as shown in figure 11, the basic structure of the display device 1 of present embodiment is identical with the display device 1 of embodiment 1 ~ 3.
The display device 1 of present embodiment, carries out in reflective display and transmission display this point different from the display device 1 of embodiment 1 ~ 3 at the same time.
In addition, Figure 11 is as an example, and with in the display device 1 of embodiment 2, the situation citing simultaneously carrying out reflective display and transmission display illustrates.
< display packing >
Then, the display packing of the situation using such display device 1 is described.In addition, also the situation using thin slice as shape anisotropy parts 32 is described below.
Display device 1 shown in Figure 11, is applicable to the situation of carrying out beautiful full-color display with low consumption electric power.
In embodiment 3, not only transmission display but also reflective display can both carry out full-color display, but the full-color and transmission of reflective display show full-color compared with poor-performing.
So in present embodiment, the part of black and white carries out reflective display, and the part of RGB carries out transmission display.
Therefore, in present embodiment, such as press each pixel of each pixel or colors, the light source as backlight 3 uses the point source of lights such as such as LED to carry out area active drive, carries out reflective display and transmission display simultaneously.
Now, the part of the partial extinguish backlight 3, RGB of black and white lights backlight 3.Thereby, it is possible to suppress power consumption and carry out beautiful full-color display.
In addition, in present embodiment, backlight 3 also can as shown in Figure 7, and the backlight 3 of assorted (such as R, G, B) is fixedly arranged on each pixel, also as shown in Figure 8,1 pixel, the illuminant colour of backlight 3 can be switched to such as R, G or B.
< driving method >
Below, the driving method of the display device 1 of present embodiment is described.In addition, below, to use thin slice as shape anisotropy parts 32, use LED as the light source of backlight 3, use TFT to be described as the situation citing of the on-off element of display panel 2.
Figure 12 is the block diagram of the schematic configuration of the major part of the display device 1 representing present embodiment.
The display device 1 of present embodiment, as shown in figure 12, comprises display panel 2, backlight 3, image IC (Integrated Circuits: integrated circuit) 4, display panel driving circuit 5, backlight driving circuit 6.
When signal of video signal is imported into display device 1, carry out area active process based on this signal of video signal (input picture).
Now, image IC4 judges white, black and R, G, B according to the luminance signal of signal of video signal and color signal that are sent to image IC4, display panel driving circuit 5 and backlight driving circuit 6 are transmitted control signal respectively, switches the orientation of thin slice and the opening and closing of LED thus.
Display panel driving circuit 5, according to the control signal based on signal of video signal of TFT delivering to each pixel, switches the frequency and the charged polarity of electrode 12,22 that are applied to the voltage of the electrode 12,22 corresponding with each pixel.
Backlight driving circuit 6 is according to the control signal based on signal of video signal (lighting control signal) being sent to each LED, according to carry out white and black displays still carry out colour display LED is opened or closed, thus, for input picture, each LED is opened or closed independently of one another.
The light-emitting area of backlight 3 is divided into rectangular, and such as M is capable × subregion field of illumination 3a (illuminating part) of N row, undertaken lighting, extinguishing by each subregion field of illumination 3a.That is, in present embodiment, at backlight 3, use (tandem) type light guide plate etc. of such as connecting to carry out the light guide plate of Region dividing like that as light guide plate, in each region, (that is, subregion field of illumination 3a) makes LED open or close.
On the other hand, display panel 2 can be divided into the multi-section display region 2a corresponding with the subregion field of illumination 3a of backlight 3 virtually.In addition, above-mentioned subregion field of illumination 3a and multi-section display region 2a is preferably corresponding with the integral multiple (more than 1 times) of 1 pixel of display panel 2, as mentioned above, such as, divides by each pixel of each pixel or colors.
In this case, as long as separator 41 is arranged at the region corresponding with the boundary member of each subregion field of illumination 3a of above-mentioned backlight 3 (that is, between neighbor or with corresponding interregional of multiple pixels of same color) of optical modulation layer 30 from time viewed from substrate 10,20 vertical directions.
In addition, Tu12Zhong, for convenience of explanation, illustrates as one of driving circuit and backlight 3 respectively using backlight driving circuit 6.But backlight driving circuit 6 differently can be arranged with backlight 3, also can arrange integratedly with backlight 3.
In above-mentioned display device 1, when carrying out white and black displays, while the TFT transmission of certain pixel (multi-section display region 2a) from display panel driving circuit 5 pairs of display panels 2 makes the control signal of the horizontal orientation of thin slice, from backlight driving circuit 6, the control signal that this LED is closed is sent to the LED be configured under this pixel (multi-section display region 2a) (being configured at the LED of the subregion field of illumination 3a corresponding with above-mentioned multi-section display region 2a).
On the other hand, when carrying out RGB display, while the TFT transmission of certain pixel (multi-section display region 2a) from display panel driving circuit 5 pairs of display panels 2 makes thin slice indulge the control signal of orientation, from backlight driving circuit 6, the control signal that this LED is opened is sent to the LED be configured under this pixel (multi-section display region 2a) (being configured at the LED of the subregion field of illumination 3a corresponding with above-mentioned multi-section display region 2a).
Thus, according to the present embodiment, reflective display and transmission display can be carried out simultaneously.
When switching orientation by transmitting control signal with TFT like this, when such as switching to horizontal orientation (direct current) from vertical orientation (interchange), offset voltage is applied to relative electrode (common electrode 22), preferred applying is compared with the low offset voltage of the maximum voltage exchanging applying, change the intensity (amplitude) to exchange the voltage applied, can switch in fact thus and exchange and direct current (regulating the magnitude relationship of flip-flop and alternating component).In addition, in maintenance horizontal orientation, (namely the position of thin slice is switched between substrate 20 (upper substrate) and substrate 10 (infrabasal plate), switch white and black) when, by making the reversal of poles of offset voltage, the polarity of direct current can be switched in fact.
< variation >
In addition, in present embodiment, with in the display device 1 of embodiment 2, the situation citing simultaneously carrying out reflective display and transmission display is illustrated.But present embodiment is not limited thereto, also area active drive be can carry out in the display device 1 of embodiment 1,3 or above-mentioned each variation, reflective display and transmission display carried out simultaneously.
Such as in the display device 1 shown in Figure 11, beautiful full-color in order to show with low consumption electric power, do not use show with transmission full-color compared with reflective display full-color of poor-performing, and carry out reflective display in the part of black and white, transmission display is carried out in the part of RGB, but in order to suppress power consumption as far as possible, in the display device 1 of the variation of embodiment 3, also can carry out reflective display and transmission display simultaneously.
In this case, as shown in the right figure of Fig. 9 (b) and left figure, the part of black and full-color part (part of such as RGB) carry out reflective display, the part of white carries out transmission display as shown in the right figure of Fig. 1 (a), can carry out the full-color display of attaching most importance to low consumption electric power thus.
But, in the display device 1 of embodiment 2, when carrying out reflective display and transmission display at the same time, such as according to being input to the signal of video signal of display device 1 when the illuminant colour of backlight 3 is replaced with R, G or B by 1 subregion field of illumination 3a (such as 1 pixel), according to the signal of video signal being input to display device 1, can at random switch the illuminant colour of backlight 3.
[embodiment 5]
About another embodiment of the invention, be described as follows based on figure and Figure 13.
In addition, in the following description, mainly to embodiment 1 ~ 4 difference be described, mark identical numbering to the inscape of the identical function of each inscape had with illustrated in above-mentioned embodiment 1 ~ 4, the description thereof will be omitted.
The schematic configuration > of < display device
Figure 13 is its another sectional view of the schematic configuration of the major part of the display device 1 representing present embodiment.
In addition, as shown in figure 13, the basic structure of the display device 1 of present embodiment is identical with the display device 1 of embodiment 1 ~ 4.
The display device 1 of present embodiment, carries out in full-color display this point different from the display device 1 of embodiment 1 ~ 4 at the colored filter 23 of each pixel arrangement R, G, B.
By using colored filter 23, whether be colored with shape anisotropy parts 32, or the light source whether using the illuminant colour with R, G, B independently, can carry out beautiful full-color display with simple structure.
In addition, the said structure of present embodiment, also can be applicable to the arbitrary structure of embodiment 1 ~ 4 and variation thereof.
Therefore, illustrate although Figure 13 illustrates with the situation making thin slice indulge orientation in transmission display, except be provided with colored filter 23 this point of R, G, B in each pixel except, be suitable for the explanation identical with embodiment 1 ~ 4.But, when the illuminant colour of backlight 3 can be switched to R, G or B in 1 subregion field of illumination 3a (such as 1 pixel), colored filter 23 cannot be configured.
In addition, the color of the color of R, G, B of backlight 3 and R, G, B of colored filter 23 needs the combination becoming same color.In addition, when carrying out painted to the surface of shape anisotropy parts 32 (thin slice), need the solid colour of the CF anisotropy parts 32 (thin slice) of R, G, B of the color of R, G, the B making backlight 3, colored filter 23.
In addition, Figure 13 with the display surface side at substrate 20 (namely, with the surface of optical modulation layer 30 opposition side) situation that is provided with colored filter 23 illustrates and illustrates, but the position of colored filter 23 is not limited thereto, according to be such as transmission display carry out colour display or at reflective display time carry out colour show, can be arranged between the insulated substrate 21 of substrate 20 and electrode 22, also can be arranged on the surface of optical modulation layer 30 side of substrate 20, also can be arranged on substrate 10 side.
But, passing through to arrange colored filter 23 at the substrate 20 of display surface side, make thin slice when substrate 20 side orientation carries out colour display, the parallax occurred between optical modulation layer 30 and colored filter 23 can be suppressed, so the colour display of high-quality can be realized.
< variation >
In addition, the display device 1 of the respective embodiments described above is not limited to above-mentioned structure, also can adopt following structure.In addition, in the following description, be described with the examples of configurations of the structure of specific substrate and specific substrate, but the structure of substrate and configuration can carry out various change.
(about voltage application method)
Alive method is executed between electrode 12,22, be not limited to direct current with exchange between the structure that switches, also offset voltage can be applied to relative electrode (common electrode), preferred applying is compared with the low offset voltage of the maximum voltage exchanging applying, change the intensity (amplitude) to exchange the voltage applied, can switch in fact thus and exchange and direct current (regulating the magnitude relationship of flip-flop and alternating component).
In addition, in the display device 1 recorded in the respective embodiments described above, according to the size etc. to the size of alternating voltage applied between electrode 12,22 and frequency, thin slice, middle gray display can be carried out.Such as be there is the thin slice varied in size by mixing, the anglec of rotation of each thin slice can be changed according to the size of thin slice.Thereby, it is possible to control (middle gray display) light transmission according to the size of alternating voltage and frequency.
(substrate)
In addition, in the respective embodiments described above, the citing of the situation of active-matrix substrate is used to be illustrated with at least one substrate in the substrate of the substrate of display surface side and rear side.But the structure of above-mentioned display panel 2 is not limited thereto.
Also whole of the inner side of the substrate of layer can be driven simply in clamping, as electrode, form the whole plane-shape electrode and comb-like electrode that are made up of the electrode film of the electric conductivity such as ITO, aluminium-vapour deposition layer, also can carry out pattern formation to the electrode that can carry out segmentation display or passive display.In addition, as mentioned above, also the active-matrix substrates such as TFT substrate can be arranged at least one substrate.
In addition, the arbitrary film of electric conductivity, insulativity and semiconductor can be formed on the electrodes of the substrate, also these films can not be set, but whether form such film and form which kind of film when being formed, the physical property according to medium 31, shape anisotropy parts 32 (thin slice etc.) designs best.
Such as using propylene carbonate at medium 31, when shape anisotropy parts 32 use aluminum slice, being provided with when being used in ito film the element thickness of SiO2 film when being the pixel cell of about 80 μm, make thin slice indulge orientation with about 5V when applying the electric field of 60Hz, even if but apply 5V direct current, also can't see the rotation to horizontal orientation applying voltage and cause.On the other hand, when using the pixel cell that the element thickness not forming film in ito film is about 80 μm, make thin slice indulge orientation when applying the electric field of 60Hz with about 5V, by applying 5V direct current, thin slice is with the horizontal orientation of the mode being attached to one-sided substrate.
The present invention is not limited to above-mentioned each embodiment, various change can be carried out, by disclosed technological means is appropriately combined and embodiment that is that obtain is also included in the technical scope of the present invention respectively in various embodiments in the scope shown in claim.
Utilizability in industry
Display device of the present invention, as the display device of Semitransmissive, can be applicable to the display device of the mobile devices such as portable phone, PDA, digital camera.
The explanation of Reference numeral
1 display device
2 display panels
2a multi-section display region
3 backlights
3a subregion field of illumination
4 image IC
5 display panel driving circuits
6 backlight driving circuits
10 substrates
11 insulated substrates
12 electrodes
20 substrates
21 insulated substrates
22 electrodes
23 colored filters
30 optical modulation layers
31 media
32 shape anisotropy parts
33 power circuits
33a AC power
33b direct supply
33c direct supply
34 switches

Claims (15)

1. the display device of a Semitransmissive, it comprises display panel and backlight, and toggle reflections display shows to show with transmission, described reflective display is by showing the light reflection from external incident, described transmission display is by making the Transmission light irradiated from described backlight show, and the feature of this display device is:
Described display panel comprises:
There is the first substrate of the first electrode;
There is the second electrode and the second substrate be oppositely disposed with described first substrate; With
Optical modulation layer, it comprises multiple shape anisotropy parts and is held between described first substrate and described second substrate, described shape anisotropy parts have reflecting surface, and make to change from the area of the projection image viewed from the normal direction of substrate by rotating
Described display device makes described shape anisotropy parts rotate by changing the frequency putting on described first electrode and described second interelectrode voltage, thus controls the transmissivity inciding the light of described optical modulation layer, and,
Make a base-adjacent in described shape anisotropy parts and described first substrate and described second substrate, and during mode orientation with the major axis of the shape anisotropy parts with this base-adjacent and described substrate-parallel, make the light inciding described optical modulation layer at described shape anisotropy parts multipath reflection, thus display black.
2. display device as claimed in claim 1, is characterized in that:
Described optical modulation layer is included in the shape anisotropy parts of at least 2 amounts of folding layer by layer when described shape anisotropy parts are paved with on a described substrate.
3. display device as claimed in claim 1, is characterized in that:
Put between described first electrode and the described second interelectrode voltage high frequency more than frequency is the low frequency of below the direct current of 0Hz or the first threshold that presets and the Second Threshold that presets and switch.
4. display device as claimed in claim 3, is characterized in that:
Described shape anisotropy parts are when putting on described first electrode and described second interelectrode voltage and being the low frequency of below direct current or described first threshold, with the mode orientation that its major axis is parallel with described second substrate with described first substrate, when putting on described first electrode and described second interelectrode voltage is the high frequency of more than described Second Threshold, with the mode orientation that its major axis is vertical with described second substrate with described first substrate.
5. the display device according to any one of Claims 1 to 4, is characterized in that:
Described shape anisotropy parts have charging property.
6. display device as claimed in claim 5, is characterized in that:
In described shape anisotropy parts and described first substrate and described second substrate have with described shape anisotropy parts the base-adjacent ground orientation of electrode of electric charge of charged opposite polarity polarity, and,
Switch described first electrode institute charged polarity and the charged polarity of described second electrode, thus, switch between described first substrate and described second substrate described shape anisotropy parts the substrate of orientation adjacently.
7. display device as claimed in claim 6, is characterized in that:
When transmission shows and reflective display time, make any one base-adjacent ground orientation in described shape anisotropy parts and described first substrate and described second substrate thus multipath reflection occurs, thus, make when reflective display by means of only the orientation of described shape anisotropy parts and transmission display time all show black.
8. the display device according to any one of claim 1 ~ 7, is characterized in that:
The light-emitting area of described backlight is divided into multiple subregion field of illumination, is configured with light source in each subregion field of illumination.
9. display device as claimed in claim 8, is characterized in that:
Be configured with in described each subregion field of illumination send each coloured light light source as described light source.
10. display device as claimed in claim 9, is characterized in that:
Described light source is monochromatic luminous light source.
11. display device as claimed in claim 9, is characterized in that:
Illuminant colour is switched by each subregion field of illumination.
12. display device according to any one of claim 8 ~ 11, is characterized in that:
Time viewed from the direction vertical with described substrate, the region corresponding with the boundary member of each subregion field of illumination of described backlight of described optical modulation layer is provided with separator.
13. display device according to any one of claim 1 ~ 12, is characterized in that:
Described shape anisotropy parts are colored.
14. display device according to any one of claim 8 ~ 13, is characterized in that:
Area active drive is carried out to described backlight, thus, carries out transmission display and reflective display simultaneously.
15. display device according to any one of claim 1 ~ 14, is characterized in that:
Each pixel of described display panel is provided with colored filter.
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